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Chapter 7 Science

TermDefinition
matter Anything that has mass and takes up space.
chemical property A characteristic of a substance that describes its ability to change into different substances.
physical property A characteristic of a pure substance that can be observed without changing it into another substance.
substance A single kind of matter that is pure and has a specific set of properties.
chemistry The study of the properties of matter and how matter changes.
chemical formula Symbols that show the elements in a compound and the ratio of atoms.
chemical bond The force of attraction that holds two atoms together.
molecule A substance made of two or more elements chemically combined in a specific ratio, or proportion.
atom The basic particle from which all elements are made; the smallest particle of an element that has the properties of that element.
element A pure substance that cannot be broken down into other substances by chemical or physical means.
compound A neutral group of two or more atoms held together by covalent bonds.
mixture Two or more substances that are together in the same place but their atoms are not chemically bonded.
chemical change A change in which one or more substances combine or break apart to form new substances.
chemical energy A form of potential energy that is stored in chemical bonds between atoms.
endothermic A change in which energy is absorbed.
exothermic A change in which energy is released.
temperature How hot or cold something is.
thermal energy The total kinetic and potential energy of all the particles of an object.
physical change A change that alters the form or appearance of a material but does not make the material into another substance.
the law of conservation of mass The principle that the total amount of matter is neither created nor destroyed during any chemical or physical change.
Created by: user-1825399
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